Description

3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[7-[(2,4-Diamino-3-Methyl-6-Sodiosulfophenyl)Azo]-4-Hydroxynaphthalene-2-Sulfonic Acid Sodium] Salt is a high-purity, complex polyazo dye intermediate essential for producing vivid and stable colorants. This compound matters for its role in synthesizing advanced dyes with superior lightfastness and wash resistance, meeting stringent industrial performance standards. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries seeking reliable, high-performance color components for their formulations.

Application

• Textile Dyeing: A key intermediate for producing high-grade, wash-fast azo dyes for cotton, wool, and synthetic fibers.
• Leather Coloring: Used in the synthesis of pigments and dyes for uniform and durable coloring of leather goods.
• Specialty Inks: Serves as a precursor for manufacturing high-performance pigments used in inks for packaging and security printing.
• Paper Dyeing: Employed in the production of dyes for coloring paper products where color consistency is critical.
• Research & Development: Utilized in chemical R&D for developing novel chromophores and studying azo dye chemistry.
• Industrial Pigments: Acts as a building block for creating complex organic pigments with specific hue and stability properties.

Basic Information

Item	Details
Product Name	3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[7-[(2,4-Diamino-3-Methyl-6-Sodiosulfophenyl)Azo]-4-Hydroxynaphthalene-2-Sulfonic Acid Sodium] Salt
CAS No.	6546-66-3
Molecular Formula	C68H48N14Na4O16S4
Molecular Weight	Approx. 1541.39 g/mol
Synonyms	Direct Black 19 (Parent Dye); C.I. 35255; 3,3'-([1,1'-Biphenyl]-4,4'-diyldi-2,1-diazenediyl)bis[7-[(2,4-diamino-3-methyl-6-sulfophenyl)diazenyl]-4-hydroxy-2-naphthalenesulfonic acid tetrasodium salt; Tetrasodium 3,3'-([1,1'-biphenyl]-4,4'-diyldi-2,1-diazenediyl)bis[7-[(2,4-diamino-3-methyl-6-sulfophenyl)diazenyl]-4-hydroxy-2-naphthalenesulfonate; Azo Dye Intermediate for Direct Black 19; Bisazo Biphenyl Dye Intermediate
EINECS	Contact for details

Quality Control

Our 3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[7-[(2,4-Diamino-3-Methyl-6-Sodiosulfophenyl)Azo]-4-Hydroxynaphthalene-2-Sulfonic Acid Sodium] Salt is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical characteristics is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); protect from excessive humidity and direct light exposure to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Loss on Drying	Max. 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Partially soluble

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.